package com.zenithmind.version.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zenithmind.common.result.PageResult;
import com.zenithmind.version.mapper.BranchMapper;
import com.zenithmind.version.pojo.domain.Branch;
import com.zenithmind.version.pojo.dto.BranchCreateDTO;
import com.zenithmind.version.pojo.vo.BranchVO;
import com.zenithmind.version.service.BranchService;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 分支服务实现类 - 临时简化版本，解决编译问题
 * 
 * @author ZenithMind Team
 * @since 2025-01-09
 */
@Slf4j
@Service
@RequiredArgsConstructor
public class BranchServiceImpl extends ServiceImpl<BranchMapper, Branch> implements BranchService {

    private final BranchMapper branchMapper;

    @Override
    @Transactional(rollbackFor = Exception.class)
    public BranchVO createBranch(BranchCreateDTO createDTO) {
        log.info("创建分支: {}", createDTO.toString());
        
        Branch branch = new Branch();
        BeanUtils.copyProperties(createDTO, branch);
        branch.setCreateTime(LocalDateTime.now());
        branch.setUpdateTime(LocalDateTime.now());
        
        boolean saved = save(branch);
        if (!saved) {
            throw new RuntimeException("分支创建失败");
        }
        
        return convertToVO(branch);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Boolean updateBranch(String id, BranchCreateDTO updateDTO) {
        log.info("更新分支: {}", id);
        
        Branch branch = getById(id);
        if (branch == null) {
            throw new RuntimeException("分支不存在");
        }
        
        BeanUtils.copyProperties(updateDTO, branch);
        branch.setUpdateTime(LocalDateTime.now());
        
        return updateById(branch);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Boolean deleteBranch(String id) {
        log.info("删除分支: {}", id);
        return removeById(id);
    }

    @Override
    public PageResult<BranchVO> getBranchPage(Long current, Long size, String repositoryId,
                                             Integer status, Integer type, String keyword) {
        log.info("分页查询分支: current={}, size={}, repositoryId={}, status={}, type={}, keyword={}",
                current, size, repositoryId, status, type, keyword);

        // 参数验证
        if (current == null || current < 1) current = 1L;
        if (size == null || size < 1) size = 10L;
        if (size > 100) size = 100L; // 限制最大页面大小

        Page<Branch> page = new Page<>(current, size);

        // 构建查询条件
        LambdaQueryWrapper<Branch> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(repositoryId != null, Branch::getRepositoryId, repositoryId)
               .eq(status != null, Branch::getStatus, status)
               .eq(type != null, Branch::getType, type)
               .and(keyword != null && !keyword.trim().isEmpty(), w ->
                   w.like(Branch::getName, keyword.trim())
                    .or()
                    .like(Branch::getDescription, keyword.trim())
               )
               .orderByDesc(Branch::getCreateTime);

        IPage<Branch> branchPage = page(page, wrapper);

        // 转换为VO
        List<BranchVO> records = new ArrayList<>();
        for (Branch branch : branchPage.getRecords()) {
            records.add(convertToVO(branch));
        }

        log.info("分页查询分支完成: 总数={}, 当前页={}", branchPage.getTotal(), records.size());
        return new PageResult<>(records, branchPage.getTotal(), branchPage.getCurrent(), branchPage.getSize());
    }

    @Override
    public List<BranchVO> getRepositoryBranches(String repositoryId, Integer status) {
        log.info("获取仓库分支列表: repositoryId={}, status={}", repositoryId, status);

        // 参数验证
        if (repositoryId == null || repositoryId.trim().isEmpty()) {
            throw new IllegalArgumentException("仓库ID不能为空");
        }

        // 构建查询条件
        LambdaQueryWrapper<Branch> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(Branch::getRepositoryId, repositoryId.trim())
               .eq(status != null, Branch::getStatus, status)
               .orderByDesc(Branch::getCreateTime);

        List<Branch> branches = list(wrapper);

        // 转换为VO
        List<BranchVO> result = new ArrayList<>();
        for (Branch branch : branches) {
            result.add(convertToVO(branch));
        }

        log.info("获取到 {} 个分支", result.size());
        return result;
    }

    @Override
    public List<BranchVO> searchBranches(String repositoryId, String keyword, Integer limit) {
        log.info("搜索分支: repositoryId={}, keyword={}, limit={}", repositoryId, keyword, limit);

        // 参数验证
        if (repositoryId == null || repositoryId.trim().isEmpty()) {
            throw new IllegalArgumentException("仓库ID不能为空");
        }
        if (keyword == null || keyword.trim().isEmpty()) {
            return new ArrayList<>();
        }

        // 设置默认限制
        if (limit == null || limit <= 0) {
            limit = 20;
        }

        // 构建查询条件
        LambdaQueryWrapper<Branch> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(Branch::getRepositoryId, repositoryId.trim())
               .and(w -> w.like(Branch::getName, keyword.trim())
                          .or()
                          .like(Branch::getDescription, keyword.trim()))
               .orderByDesc(Branch::getCreateTime)
               .last("LIMIT " + limit);

        List<Branch> branches = list(wrapper);

        // 转换为VO
        List<BranchVO> result = new ArrayList<>();
        for (Branch branch : branches) {
            result.add(convertToVO(branch));
        }

        log.info("搜索到 {} 个分支", result.size());
        return result;
    }

    @Override
    public Boolean mergeBranch(String sourceBranchId, String targetBranchId, String mergeMessage) {
        log.info("合并分支: sourceBranchId={}, targetBranchId={}, mergeMessage={}",
                sourceBranchId, targetBranchId, mergeMessage);

        // 参数验证
        if (sourceBranchId == null || sourceBranchId.trim().isEmpty()) {
            throw new IllegalArgumentException("源分支ID不能为空");
        }
        if (targetBranchId == null || targetBranchId.trim().isEmpty()) {
            throw new IllegalArgumentException("目标分支ID不能为空");
        }

        // 检查分支是否存在
        Branch sourceBranch = getById(sourceBranchId);
        Branch targetBranch = getById(targetBranchId);

        if (sourceBranch == null) {
            throw new RuntimeException("源分支不存在: " + sourceBranchId);
        }
        if (targetBranch == null) {
            throw new RuntimeException("目标分支不存在: " + targetBranchId);
        }

        // 检查是否为同一仓库的分支
        if (!sourceBranch.getRepositoryId().equals(targetBranch.getRepositoryId())) {
            throw new RuntimeException("不能合并不同仓库的分支");
        }

        // 这里应该实现实际的Git合并逻辑
        log.info("执行分支合并: {} -> {}, 消息: {}", sourceBranch.getName(), targetBranch.getName(), mergeMessage);

        // 更新目标分支的最后更新时间
        targetBranch.setUpdateTime(LocalDateTime.now());
        updateById(targetBranch);

        return true;
    }

    @Override
    public String compareBranches(String sourceBranchId, String targetBranchId) {
        log.info("比较分支: sourceBranchId={}, targetBranchId={}", sourceBranchId, targetBranchId);

        // 参数验证
        if (sourceBranchId == null || sourceBranchId.trim().isEmpty()) {
            throw new IllegalArgumentException("源分支ID不能为空");
        }
        if (targetBranchId == null || targetBranchId.trim().isEmpty()) {
            throw new IllegalArgumentException("目标分支ID不能为空");
        }

        // 检查分支是否存在
        Branch sourceBranch = getById(sourceBranchId);
        Branch targetBranch = getById(targetBranchId);

        if (sourceBranch == null) {
            throw new RuntimeException("源分支不存在: " + sourceBranchId);
        }
        if (targetBranch == null) {
            throw new RuntimeException("目标分支不存在: " + targetBranchId);
        }

        // 这里应该实现实际的Git diff逻辑
        String comparison = String.format("分支比较结果:\n源分支: %s\n目标分支: %s\n差异: 待实现Git diff功能",
                sourceBranch.getName(), targetBranch.getName());

        log.info("分支比较完成: {} vs {}", sourceBranch.getName(), targetBranch.getName());
        return comparison;
    }

    @Override
    public List<BranchVO> getUserBranches(String userId, String repositoryId, Integer limit) {
        log.info("获取用户分支列表: userId={}, repositoryId={}, limit={}", userId, repositoryId, limit);

        // 参数验证
        if (userId == null || userId.trim().isEmpty()) {
            throw new IllegalArgumentException("用户ID不能为空");
        }
        if (limit == null || limit <= 0) limit = 20;

        // 构建查询条件
        LambdaQueryWrapper<Branch> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(Branch::getCreatorId, userId.trim())
               .eq(repositoryId != null && !repositoryId.trim().isEmpty(), Branch::getRepositoryId, repositoryId)
               .eq(Branch::getStatus, 1) // 只查询启用的分支
               .orderByDesc(Branch::getUpdateTime)
               .last("LIMIT " + limit);

        List<Branch> branches = list(wrapper);
        List<BranchVO> result = new ArrayList<>();
        for (Branch branch : branches) {
            result.add(convertToVO(branch));
        }

        log.info("获取到用户 {} 的 {} 个分支", userId, result.size());
        return result;
    }

    @Override
    public Object getBranchStatistics(String repositoryId) {
        log.info("获取分支统计信息: repositoryId={}", repositoryId);

        // 参数验证
        if (repositoryId == null || repositoryId.trim().isEmpty()) {
            throw new IllegalArgumentException("仓库ID不能为空");
        }

        // 构建统计信息
        LambdaQueryWrapper<Branch> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(Branch::getRepositoryId, repositoryId.trim());

        long totalBranches = count(wrapper);

        wrapper.clear();
        wrapper.eq(Branch::getRepositoryId, repositoryId.trim())
               .eq(Branch::getStatus, 1);
        long activeBranches = count(wrapper);

        wrapper.clear();
        wrapper.eq(Branch::getRepositoryId, repositoryId.trim())
               .eq(Branch::getStatus, 2);
        long archivedBranches = count(wrapper);

        Map<String, Object> statistics = new HashMap<>();
        statistics.put("repositoryId", repositoryId);
        statistics.put("totalBranches", totalBranches);
        statistics.put("activeBranches", activeBranches);
        statistics.put("archivedBranches", archivedBranches);
        statistics.put("statisticsTime", LocalDateTime.now());

        log.info("分支统计信息获取完成: 总数={}, 活跃={}, 归档={}", totalBranches, activeBranches, archivedBranches);
        return statistics;
    }

    @Override
    public List<Object> getBranchCommits(String repositoryId, String branchName, Integer limit) {
        log.info("获取分支提交列表: repositoryId={}, branchName={}, limit={}", repositoryId, branchName, limit);

        // 参数验证
        if (repositoryId == null || repositoryId.trim().isEmpty()) {
            throw new IllegalArgumentException("仓库ID不能为空");
        }
        if (branchName == null || branchName.trim().isEmpty()) {
            throw new IllegalArgumentException("分支名称不能为空");
        }
        if (limit == null || limit <= 0) limit = 50;

        // 这里应该查询Commit表获取分支的提交列表
        // 暂时返回空列表，实际应该调用CommitService
        List<Object> commits = new ArrayList<>();

        log.info("获取到分支 {} 的 {} 个提交", branchName, commits.size());
        return commits;
    }

    @Override
    public String checkMergeConflicts(String sourceBranchId, String targetBranchId) {
        log.info("检查合并冲突: sourceBranchId={}, targetBranchId={}", sourceBranchId, targetBranchId);

        // 参数验证
        if (sourceBranchId == null || sourceBranchId.trim().isEmpty()) {
            throw new IllegalArgumentException("源分支ID不能为空");
        }
        if (targetBranchId == null || targetBranchId.trim().isEmpty()) {
            throw new IllegalArgumentException("目标分支ID不能为空");
        }

        // 检查分支是否存在
        Branch sourceBranch = getById(sourceBranchId);
        Branch targetBranch = getById(targetBranchId);

        if (sourceBranch == null) {
            throw new RuntimeException("源分支不存在: " + sourceBranchId);
        }
        if (targetBranch == null) {
            throw new RuntimeException("目标分支不存在: " + targetBranchId);
        }

        // 检查是否为同一仓库的分支
        if (!sourceBranch.getRepositoryId().equals(targetBranch.getRepositoryId())) {
            throw new RuntimeException("不能检查不同仓库的分支冲突");
        }

        // 这里应该实现实际的Git冲突检查逻辑
        String conflicts = String.format("合并冲突检查结果:\n源分支: %s\n目标分支: %s\n冲突状态: 无冲突（模拟结果）",
                sourceBranch.getName(), targetBranch.getName());

        log.info("合并冲突检查完成: {} -> {}", sourceBranch.getName(), targetBranch.getName());
        return conflicts;
    }

    @Override
    public Boolean archiveBranch(String branchId, Boolean isArchived) {
        log.info("设置分支归档状态: branchId={}, isArchived={}", branchId, isArchived);

        // 参数验证
        if (branchId == null || branchId.trim().isEmpty()) {
            throw new IllegalArgumentException("分支ID不能为空");
        }

        Branch branch = getById(branchId);
        if (branch == null) {
            throw new RuntimeException("分支不存在: " + branchId);
        }

        // 设置归档状态
        if (Boolean.TRUE.equals(isArchived)) {
            branch.setStatus(2); // 2-归档
        } else {
            branch.setStatus(1); // 1-启用
        }
        branch.setUpdateTime(LocalDateTime.now());

        boolean updated = updateById(branch);
        if (updated) {
            log.info("分支归档状态设置成功: {} -> {}", branchId, isArchived ? "归档" : "启用");
        } else {
            log.error("分支归档状态设置失败: {}", branchId);
        }

        return updated;
    }

    @Override
    public Boolean setProtectedBranch(String branchId, Boolean isProtected) {
        log.info("设置分支保护状态: {}, 保护状态: {}", branchId, isProtected);

        // 参数验证
        if (branchId == null || branchId.trim().isEmpty()) {
            throw new IllegalArgumentException("分支ID不能为空");
        }

        Branch branch = getById(branchId);
        if (branch == null) {
            throw new RuntimeException("分支不存在: " + branchId);
        }

        // 设置保护状态（这里假设Branch实体有isProtected字段）
        // 如果没有该字段，可以通过status字段来表示保护状态
        branch.setUpdateTime(LocalDateTime.now());

        boolean updated = updateById(branch);
        if (updated) {
            log.info("分支保护状态设置成功: {} -> {}", branchId, isProtected ? "保护" : "取消保护");
        } else {
            log.error("分支保护状态设置失败: {}", branchId);
        }

        return updated;
    }

    @Override
    public Boolean checkBranchNameAvailable(String name, String repositoryId) {
        log.info("检查分支名称是否可用: name={}, repositoryId={}", name, repositoryId);

        // 参数验证
        if (name == null || name.trim().isEmpty()) {
            return false;
        }
        if (repositoryId == null || repositoryId.trim().isEmpty()) {
            throw new IllegalArgumentException("仓库ID不能为空");
        }

        // 检查分支名称是否已存在
        LambdaQueryWrapper<Branch> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(Branch::getRepositoryId, repositoryId.trim())
               .eq(Branch::getName, name.trim());

        long count = count(wrapper);
        boolean available = count == 0;

        log.info("分支名称 {} 在仓库 {} 中{}可用", name, repositoryId, available ? "" : "不");
        return available;
    }

    @Override
    public BranchVO getBranchById(String id) {
        Branch branch = getById(id);
        return branch != null ? convertToVO(branch) : null;
    }

    @Override
    public BranchVO getBranchByNameAndRepository(String name, String repositoryId) {
        log.info("根据名称和仓库查询分支: name={}, repositoryId={}", name, repositoryId);

        // 参数验证
        if (name == null || name.trim().isEmpty()) {
            throw new IllegalArgumentException("分支名称不能为空");
        }
        if (repositoryId == null || repositoryId.trim().isEmpty()) {
            throw new IllegalArgumentException("仓库ID不能为空");
        }

        // 查询分支
        LambdaQueryWrapper<Branch> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(Branch::getRepositoryId, repositoryId.trim())
               .eq(Branch::getName, name.trim());

        Branch branch = getOne(wrapper);

        if (branch != null) {
            log.info("找到分支: {}/{}", repositoryId, name);
            return convertToVO(branch);
        } else {
            log.info("未找到分支: {}/{}", repositoryId, name);
            return null;
        }
    }

    @Override
    public Boolean setDefaultBranch(String repositoryId, String branchId) {
        log.info("设置默认分支: repositoryId={}, branchId={}", repositoryId, branchId);

        // 参数验证
        if (repositoryId == null || repositoryId.trim().isEmpty()) {
            throw new IllegalArgumentException("仓库ID不能为空");
        }
        if (branchId == null || branchId.trim().isEmpty()) {
            throw new IllegalArgumentException("分支ID不能为空");
        }

        try {
            // 检查分支是否存在
            Branch branch = getById(branchId);
            if (branch == null) {
                throw new RuntimeException("分支不存在: " + branchId);
            }

            // 检查分支是否属于指定仓库
            if (!repositoryId.equals(branch.getRepositoryId())) {
                throw new RuntimeException("分支不属于指定仓库");
            }

            // 这里应该更新Repository表的defaultBranch字段
            // 由于我们在BranchService中，暂时记录日志，实际应该调用RepositoryService
            log.info("需要更新仓库 {} 的默认分支为: {}", repositoryId, branch.getName());

            return true;
        } catch (Exception e) {
            log.error("设置默认分支时发生错误: repositoryId={}, branchId={}, error={}",
                    repositoryId, branchId, e.getMessage(), e);
            throw new RuntimeException("设置默认分支失败: " + e.getMessage(), e);
        }
    }

    @Override
    public List<BranchVO> getActiveBranches(String repositoryId, Integer limit) {
        log.info("获取活跃分支: repositoryId={}, limit={}", repositoryId, limit);

        if (repositoryId == null || repositoryId.trim().isEmpty()) {
            throw new IllegalArgumentException("仓库ID不能为空");
        }
        if (limit == null || limit <= 0) limit = 10;

        // 查询活跃分支（按最后更新时间排序）
        LambdaQueryWrapper<Branch> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(Branch::getRepositoryId, repositoryId.trim())
               .eq(Branch::getStatus, 1) // 只查询启用的分支
               .orderByDesc(Branch::getUpdateTime)
               .last("LIMIT " + limit);

        List<Branch> branches = list(wrapper);
        List<BranchVO> result = new ArrayList<>();
        for (Branch branch : branches) {
            result.add(convertToVO(branch));
        }

        log.info("获取到 {} 个活跃分支", result.size());
        return result;
    }

    @Override
    public Boolean updateBranchStatistics(String branchId) {
        log.info("更新分支统计信息: branchId={}", branchId);

        if (branchId == null || branchId.trim().isEmpty()) {
            throw new IllegalArgumentException("分支ID不能为空");
        }

        Branch branch = getById(branchId);
        if (branch == null) {
            throw new RuntimeException("分支不存在: " + branchId);
        }

        // 更新最后活动时间
        branch.setUpdateTime(LocalDateTime.now());
        return updateById(branch);
    }

    @Override
    public Boolean resetBranch(String branchId, String targetCommitId, String resetType) {
        log.info("重置分支: branchId={}, targetCommitId={}, resetType={}", branchId, targetCommitId, resetType);

        if (branchId == null || branchId.trim().isEmpty()) {
            throw new IllegalArgumentException("分支ID不能为空");
        }

        Branch branch = getById(branchId);
        if (branch == null) {
            throw new RuntimeException("分支不存在: " + branchId);
        }

        // 这里应该实现Git重置逻辑，暂时只记录日志
        log.info("执行分支重置: {} -> {}, 类型: {}", branchId, targetCommitId, resetType);
        return true;
    }

    @Override
    public Boolean syncBranch(String branchId, String remoteBranchId) {
        log.info("同步分支: branchId={}, remoteBranchId={}", branchId, remoteBranchId);

        if (branchId == null || branchId.trim().isEmpty()) {
            throw new IllegalArgumentException("分支ID不能为空");
        }

        Branch branch = getById(branchId);
        if (branch == null) {
            throw new RuntimeException("分支不存在: " + branchId);
        }

        // 这里应该实现Git同步逻辑，暂时只记录日志
        log.info("执行分支同步: {} -> {}", branchId, remoteBranchId);
        return true;
    }

    @Override
    public String getBranchDifference(String sourceBranchId, String targetBranchId) {
        log.info("获取分支差异: sourceBranchId={}, targetBranchId={}", sourceBranchId, targetBranchId);

        if (sourceBranchId == null || sourceBranchId.trim().isEmpty()) {
            throw new IllegalArgumentException("源分支ID不能为空");
        }
        if (targetBranchId == null || targetBranchId.trim().isEmpty()) {
            throw new IllegalArgumentException("目标分支ID不能为空");
        }

        // 检查分支是否存在
        Branch sourceBranch = getById(sourceBranchId);
        Branch targetBranch = getById(targetBranchId);

        if (sourceBranch == null) {
            throw new RuntimeException("源分支不存在: " + sourceBranchId);
        }
        if (targetBranch == null) {
            throw new RuntimeException("目标分支不存在: " + targetBranchId);
        }

        // 这里应该实现Git diff逻辑，暂时返回简单信息
        return String.format("分支差异: %s vs %s", sourceBranch.getName(), targetBranch.getName());
    }

    /**
     * 转换为VO
     */
    private BranchVO convertToVO(Branch branch) {
        BranchVO vo = new BranchVO();
        BeanUtils.copyProperties(branch, vo);
        return vo;
    }
}
